code: def __len__(self):
      return len(self.batches)
  
imports: import io
  import json
  import pickle
  from collections import OrderedDict
  from dataclasses import dataclass
  from typing import Any, List, Optional
  import braceexpand
  import numpy
  import webdataset
  from torch.utils.data import IterableDataset
  from nemo.collections.nlp.data.data_utils.data_preprocessing import dataset_to_ids
  from nemo.core import Dataset
  from nemo.utils import logging
label_desc: Use image node_id 3 for calling the TranslationDataset obj's underlying member method code with example usage: obj.__len__() and returns: len